French police are likely to make more arrests in connection with last weekend’s anti-terror operation.
Interior Minister Manuel Valls has warned there could be hundreds of other members of a radical Islamist group operating in the country.
On Saturday, one man was killed and 12 people were detained during nationwide raids that included the cities of Paris, Strasbourg and Cannes.
“It was a dangerous group or cell, which needed to be neutralized. Other targets were probably planned; investigations will allow us to determine that. Maybe some in this group wanted to take part in Jihad abroad. So we remain cautious,” said Valls.
During the raid in Strasbourg, a 33-year-old man was shot dead. Investigators believe he and another person were behind a grenade attack on a Jewish supermarket in Paris last month.
A recent convert to Islam, his death has re-ignited fears that others are being radicalised on French soil.
The latest operation turned up weapons, nearly 30,000 euros in cash and a list of Jewish groups in the Paris area.